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Dynamic caustics by ultrasonically modulated liquid surface.

Koki Nagakura1, Tatsuki Fushimi2,3,4, Ayaka Tsutsui1

  • 1Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, 305-8550, Japan.

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|August 29, 2025
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Summary
This summary is machine-generated.

Researchers developed a new method for dynamic caustic patterns using dual-optimised holographic fields and Phased Array Transducers (PAT). This technique uses ultrasound to shape liquid surfaces, creating real-time, controllable caustic images with a Digital Twin framework.

Keywords:
Acoustic holographyDigital twinDynamic causticsLiquid surface manipulationUltrasonic modulation

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Area of Science:

  • Optics
  • Acoustics
  • Fluid Dynamics
  • Computational Imaging

Background:

  • Static caustic optimization and ultrasonic manipulation have been explored previously.
  • Integrating liquid surfaces as refractive media for caustics has been simulated but not practically realized.
  • Previous methods for dynamic caustics were limited in flexibility and real-time control.

Purpose of the Study:

  • To present a novel method for generating dynamic caustic patterns using ultrasound.
  • To demonstrate the practical application of liquid surfaces as dynamic refractive media for caustics.
  • To leverage a Digital Twin framework for real-time feedback and optimization of caustic generation.

Main Methods:

  • Utilisation of dual-optimised holographic fields with Phased Array Transducer (PAT).
  • Employing computational techniques to dynamically shape fluid surfaces.
  • Implementing a Digital Twin framework for iterative feedback and refinement.

Main Results:

  • Successful generation of dynamic caustic patterns with controllable, real-time animations.
  • Demonstrated high-frequency generation of complex caustic patterns using liquid surfaces.
  • Achieved precise adjustments and optimization through the Digital Twin approach.

Conclusions:

  • The presented method enables flexible, real-time generation of dynamic caustics using liquid surfaces.
  • The Digital Twin framework enhances accuracy and quality of generated patterns.
  • Potential applications include interactive displays, artistic installations, and educational tools, despite current limitations in contrast and resolution.